Need some Relationship Advice?

Ok, I have been married for almost a year now and already there has been alot of problems. Starting off my husband stays at work from 5 am to 8:30pm. I have asked him to start coming home early because for one I would like to spend some time with him and his children (my step children) are starting to ask why daddy is never here anymore! He delivers pop to the stores in our area. I know that it takes awhile but not 15 to 20 hours. There has been nights that he didn't get home until almost 11 pm. His children for the past two weeks have been terrors, beyond terrors! His daughter just opened up to me yesterday and told me that she is acting up to get daddys attention! This hurts. His mother even feels the same as me. When he is home he doesn't try to spend time the only thing he does is sit down and prank around with his work handheld and items he brought home that relates right back to the work. Here lately I am being the mother, father, cook, laundary mat, house cleaner, and it starting to feel like that's exactly how he wants it. Another thing one of my friends came over last night to help me make some blankets to sell since he can't find a babysitter for his children in order for me to work. He sat right up next to us staring her down (which he denies). Ok, last night I asked him to go to the kitchen and get something for me because frankly I had been on my feet since 7 am yesterday morning and was tired. He said he would. Fine! 45 minutes later after he followed me and my friend outside on the porch he advised me he was going to bed. He never went got nothing for me like I had asked. I asked him to tell his daughter to stop kicking the wall. Due to the fact I have pictures hanging on it and didn't want them to fall and hurt her. Instead of him getting up and walking to her door to tell her (which is right beside the living room) he hollered across the room. Now this has been going on for awhile and I really don't want to leave, but I am about out of options. 3 weeks ago, I found a female on his voicemail telling him to call her back asap. Confronted him about that he said he had no clue. The main reasons I am holding on is because I love him and do not want to lose my step children! I would hate to see them if I was to leave! Someone please help because I am fed up with all of this!